What is the temperature for an almost completely absorbing dark planet at 1 AU and with a reflectivity of 10.0%?
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What is the temperature for an almost completely absorbing dark planet at 1 AU and with a reflectivity of 10.0%?
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- Nearly all planets that astronomers have found orbiting other stars have been giant planets with masses more like Jupiter than Earth, and with orbits located very close to their parent stars. Does this prove that our Solar System is unique? Explain your answer.Light takes about 8.3 minutes to travel from the Sun to Earth. When it is closest, Neptune is 30.0 times farther from Earth than the Sun is. Make a prediction: Should light take more or less time to reach Earth from Neptune than from the Sun?The orbital velocity for a sattelite orbiting earth at it's radius is 8 km/s. What would be the orbital velocity around a planet that was 2 times as massive as earth but 1/2 the size?
- Using a 8-m reflector telescope on Mars, what is the maximum distance we could measure using stellar parallax?(a) Auroras have been observed near the magnetic poles of Uranus. (i) Explain how these lights are produced. (ii) While searching for the auroras of Uranus, an orbiting satellite registered the spectral lines. These are emitted by hydrogen atoms during the transition from the first excited state to the ground state. Calculate the wavelength of this radiation and indicate the region of the electromagnetic spectrum in which the satellite made the observation.A scientist has evidence that a newly discovered planet has a mass of 7.0\times 10^(24) kilograms and a volume of 3.5\times 10^(12) cubic kilometers. What is the planet's density?
- Venus can be as bright as apparent magnitude -4.7 when at a distance of about 1 AU. How many times fainter would Venus look from a distance of 5 pc? Assume Venus has the same illumination phase from your new vantage point. (Hints: Recall the inverse square law; also, review the definition of apparent visual magnitudes. ote: 1 pc = 2.1 x 10° AU). times fainter What would its apparent magnitude be? Need Help? Read ItJupiters moon, lo, loses about 119.0 kg /s of sulfur dioxide to Jupiter's magnetosphere. At this rate, what percent if it's mass would lo lose in 3.0x109 years? Lo has a mass about 1x1023 kg and there are 3.15 x107 seconds in a yearAt its closest approach to Earth, Mars is 57.50 million kilometers away. How long (in minutes) would a radio signal sent from a future manned mission to Mars take to travel to Earth? (distance = speed x time) [55]
- Why is pluto not considered a major planet? Explain.Venus can be as bright as apparent magnitude −4.7 when at a distance of about 1 AU. How many times fainter would Venus look from a distance of 7 pc? Assume Venus has the same illumination phase from your new vantage point. (Hints: Recall the inverse square law; also, review the definition of apparent visual magnitudes. Note: 1 pc = 2.1 ✕ 105 AU). [fill in the blank] times fainter What would its apparent magnitude be?A new mystery planet is detected around our Sun. We measure it’s position relative to the Sun to be 2 AU at perihelion and 6 AU at aphelion. What is the semi-major axis of this planet’s orbit (in AU)? With that information, what is the orbital period of that planet(in years)?